<!DOCTYPE html>
<html>
<head>
    <title>课堂行为评价系统</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background-color: #f0f2f5;
        }
        .container {
            text-align: center;
            padding: 40px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .button-container {
            display: flex;
            gap: 20px;
            margin-top: 30px;
        }
        .role-button {
            padding: 15px 30px;
            font-size: 18px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            text-decoration: none;
            color: white;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .role-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        .teacher-btn {
            background-color: #1a73e8;
        }
        .student-btn {
            background-color: #34a853;
        }
        h1 {
            color: #333;
            margin-bottom: 20px;
        }
        .description {
            color: #666;
            margin-top: 20px;
            font-size: 14px;
            max-width: 400px;
            line-height: 1.6;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>课堂行为评价系统</h1>
        <div class="button-container">
            <a href="/static/teacher.html" class="role-button teacher-btn">教师入口</a>
            <a href="/static/student.html" class="role-button student-btn">学生入口</a>
        </div>
        <div class="description">
            <p>欢迎使用课堂行为评价系统！</p>
            <p>教师可以通过教师入口为小组打分，学生可以通过学生入口进行自评。</p>
        </div>
    </div>
</body>
</html>